syslet: add proper read barrier between user_tail and completion read

[fio.git] / arch / arch-alpha.h

diff --git a/arch/arch-alpha.h b/arch/arch-alpha.h
index b899494fec7b41b359b75a2a66a39567cafb8578..a476891aecf4cbe4268a4c617e41c4aa33526905 100644 (file)
--- a/arch/arch-alpha.h
+++ b/arch/arch-alpha.h
@@ -14,5 +14,6 @@
 
 #define nop            do { } while (0)
 #define fio_ffz(v)     generic_ffz((v))
+#define read_barrier() __asm__ __volatile__("mb": : :"memory")
 
 #endif